A number plan determines how many and which digits are necessary for call routing.

A number plan in telephony determines how many and which digits are necessary for call routing. This concept is essential for defining how calls are processed and routed within a telephony system, including Genesys Cloud CX. The number plan dictates the structure of phone numbers, including length and the specific digits required to reach certain destinations, ensuring that calls are directed correctly based on the dialed numbers.

References:

Genesys Cloud CX Telephony and Call Routing Documentation​​​.